Study on Preventing Urban Constructed Facilities from Earthquake Disaster

本研究的主要目的是获得防止建筑结构和已建设施遭受破坏性地震灾害的方法。本项目包括三个子项目。(1)穿层地震动特性的研究;（2）建筑物的相关结构破坏研究;以及（3）不规则土结构对反应谱影响的研究，通过多点同步观测，得到了断层附近地震动的特征，并沿测线沿着测量了激振器激发的地震动地下有不规则的地质结构。将这些观测和实验结果与理论预测值进行了比较，发现断层附近地震动的幅值和峰值频率随与假定的不连续地质线的相对位置而变化。在振动试验中，地下不规则结构测点的速度响应与计算值符合较好，在SH波入射情况下，研究了地形对地表运动的影响。分析了几种类型的隐伏谷地形。应用边界积分方程法对场运动方程进行数值积分。通过对几种地基模型的地震动响应与精确解的比较，验证了该方法的准确程度。

The main purpose of the research project is to obtain the methods of preventing the building structure and constructed facilities from destructive earthquake disaster. This project comprises 3 sub-project.(1) The study on the characteristics of the earthquake ground motions through layers, (2) the study on the associated structure damage of the building, and (3) the study on the effect o irregular soil structures on response spectra.The characteristics of the earthquake ground motion near the fault are obtained from the simultaneous observation at many points and the motions excited by the vibration generator are measured along the survey line having underground irregular geologic structures. These observational and experimental results are compared with the predicted theoretical values.It is found from observational and theoretical results that the amplitudes and peak frequencies of the ground motion near the fault are variable depending on relative positions to the presumed discontinuous geologic line. In the case of vibration tests, the velocity responses of measure points with underground irregularities are found to be corresponded with the calculated values.The effect of topography on surface motion is investigated in the case of incident SH wave. Several types of buried valley topography are analyzed. The method of boundary integral equation is applied for numerical integration of the field equation of motion. The degree of accuracy of the method is examined by comparing the response of ground motion calculated by this method with that of exact solution for several ground models.